Volkswagen 1.6i strange problem - Fixed

Ok so I unplugged the Tps signal wire - the car still doesn't idle.

The throttlebody wiring was tampered with and i found the following values from my recent test

Key on engine off - testing throttlebody wiring
Pin 1: idle control motor +12v - 0v
Pin 2: idle control motor ground - 0v
Pin 3: closed throttle position switch for idle motor - 11.8v
Pin 4: tps +5v supply/reference - 5.03v
Pin 5: tps signal to ecu - 5.52
Pin 6: not used
Pin 7: ground - 0v
Pin 8: closed throttle position switch for idle motor - 5.52v

Key on engine on
Pin 1 - varies around 2-13v
Pin 3 - snapping the throttle 8-13v
Pin 8 - constant 3.4v

Sensor ground on pin 7 was way too loose and broke off when i touched it, I am going to sort that out and retest. I honestly have no direction with this car and don't know what to expect next.

Hmm we need information on the closed throttle switch that doesn't seem right to me. it is responsible for telling the ecu to take control of idle

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Yeah man I don't know what to do now.. Im asking around for a proper wiring digram

Have you spoken to the customer as to when the throttle surging started if someone had worked on it at that time, what was done .... I've been looking for information as well but I haven't really found anything on that vehicle . Have you cleaned the throttle body and the IAC ports?

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Yes i did, he does not speak English very well so it was difficult for me to understand what he was trying to say.

The car had alot of people working on it though, had a distributor problem, starter problem, alternator problem, all of those parts were changed with aftermarket pirate parts.

I did clean the entire throttlebody.

The voltages on the closed throttle position switch is confusing me.. Common sense tells you that there should be a closed throttle position switch and an open throttle position switch, and thats the reason I dont want to rely on the pinout info that I have.
I was unfortunate that i could not meet my friend who has a similar vehicle to do a few tests on his car

Can you post a pic of the throttle body so I can see if it looks like anything I've seen

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Ok hold on a few minutes..

Isnt the idle control motor a pwm circuit? (pulse width modulation)

Ok that throttle body does require alignment which method did you use #1 ? Did you check the code in the engine module on your vag com as to which 1 you have ? Here's the link

wiki.ross-tech.com/wiki/index.php/Throttle_Body_Alignment_(TBA)

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I used the Cable-throttled engines method group 098.

And i did it every time I disconnect the tb, made no difference

Do you hear the throttle body cycle when you do it and check the ecu to make sure it's not the 2nd 1 I had 1 customer with a early b5 passat that had cable and still used the 2nd adaptation and it wouldn't run without doing the TBA

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Yes I do hear it doing the cycle, I even saw it.

What do you mean by check the ecu to make sure its not the second one?

Oh yes.. Im sure I used the correct method because i only knew about group 098.. lol

And the tb does cycle for a few seconds

Do you have the part number of the throttle body maybe I can find pin information based on that

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I dont know the part number off hand.. but I will remove it and post up the part number

Part Number is: 1 HS 133 064

I didn't have time to get the throttlebody plug today, I cannot fix the ground wire because its broken off from the pin inside in the plug, i would be able to get 1 from the junk yard tomorrow. I did try checking for voltage again on Pin 1, which states in the diagram that I have, Pin1=+12v, I am now getting 0.05V from that wire...
If I disconnect Pin1 from the ecu plug and put a direct 12v onto it, I noticed that the stepper motor moves back and forth rapidly causing thee idle to fluctuate even more, so I am guessing that Pin1 is not suppose to have a constant 12v supply and the ecu probably regulates the voltage according to other signals.
I think we need to know how this component actually works in order to find the problem.

I will however try to get a decent throttlebody plug tomorrow, reconnect all the wires and then check from there, because there could be bad connections on the other wires causing a voltage drop somewhere across the line therefore correct values are not being sent to the ecu or to the tb.. (I dont know if that makes sense, does it?)

I have found a wiring diagram

ECU PINOUT:
Pin17 - Common sensor ground
Pin14 - TPS 5v Ref
Pin41 - TPS Signal wire
Pin16 - Throttle position switch (open or closed switch???)
Pin10 - Throttle position switch (open or closed switch???)
Pin2 - Idle control motor +12v
Pin26 - Idle control motor ground

Ok I'm busy at work today I'll sit down and look it over after work . Definitely get that plug fixed a bad ground will cause all sorts of problems!

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Ok I will appreciate that man, I cant seem to figure this diagram out, will definitely need some help.